Race Condition Vulnerability in Linux Kernel - Potential Impact on System Stability

CVE-2025-39754

What is CVE-2025-39754?

A race condition has been identified in the Linux kernel that involves the smaps_hugetlb_range() function interacting with the migration process. This can lead to a critical situation where concurrent operations may trigger a system crash, specifically through the BUG_ON failure in the pfn_swap_entry_to_page() function. The vulnerability arises when smaps_hugetlb_range accesses the page table entry without holding a necessary lock, thereby allowing a possibility of conflict when migration takes place. The issue has been addressed by enforcing a consistent locking mechanism within the smaps_hugetlb_range function to prevent disruptions during page migrations.

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